Telephone system for toll traffic.



C. R. H. ARNTZENIUS.

TELEPHONE SYSTEM FOR TOLL TRAFFIC.

APPLICATION FILED s513119. 1913.

1,214,258.,- Patented Jim. 30, 1917.

` 4 SHEETS-SWEET 1.

Vig/l.

C. R. H ARNTZENIUS. TELEPHONE SYSTEM FOR ToLL TRAFFIC.

APPUCATION FILED SEPT. I9, 1913.

Patented Jan. 30,1917.

4 SHEETS-SHEET 2- Sj f8 f7 38 4 40 CRl/Mrnzemu. ENVENTR ATTRNELY C. R.H. ARNTZFNIUS.

TELEPHONE SYSTEM FOR TOLL TRAFFIC.

APPLlcATIoN FILED sEPT.19.1913.

lg Patented Jan. 30, 1917,

4 SHEETS-SHEET 3.

[al Viz MNESSES A www@ Anims' C. R. H. ARNTZENIUS.

TELEPHONE SYSTEM FOR TOLL TRAFFIC.

. y APPLICATION FILED SEPT. I9. 1913.

Patented Jan. 30,1917.

4 SHEETS-,SHEET 4.

L 1 CRHArnIzemus INVENTII wTNEssEa CAROLUS ROBERT HENDRIK ARNTZENUIS, OFTHE HAGUE, NETHERLANDS.

TELEPHONE SYSTEM FOR TOLL TRAFFIC.

Application filed September 181, 1913.

To all fav/1,0m #may concern.'

Be it known that l, CAnoLUs ROBERT rinnoain rlnxrznnius, a subject ot'the Queen of the Netherlands. and residing at Nassau Odyckstraat Q9, TheHague, Netherlands, have invented a certain new and useful T elephoneSystem for Toll Trai'lic, of which the following is a specification.

The invention relates to a switching tem ifor toll telephoneconnections. securing in a direct and simple way the handling of thetraiiic in one direction only between two toll telephone exchanges ineach of which the connection olf the concerned subscribers lines withthe switching trunks is obtained by means of an order wire service.

Ot late years a great many signal systems with different circuitscontaining relays, lamps and the like have been. adopted with the objectoi simplifying trie handling of tratlic. Morse signaling has even beenemployed at very busy periods. However, the completing ot tollconnections always requires the assistance of at least two tolloperators at the exchanges in question, in addition to the operators forconnecting the switching trunks with the subscribers lines.

lt is very desirable where the question or" a ready and economicalhandling of the trai'lic between two busy toll exchanges .is concernednot to load the lines between the exchanges with calls in bothdirections, but to separate the traffic into two groups one cr eachdirection.

T he object of this invention is to provide a telephone system whichwill permit the completion oit the toll connections for each directionby the assistance of only one toll operator (the calling) and twoswitching operators (one at the calling and lthe other t the calledlocal exchange) the calling operator controlling the trahie-71 e. makingthe necessary connccticns lor the calls demanded at ier exchange, andbeing relieved or assisted by a suitable automatical. time recordingdevice. y

According to the present invention the calling toll operator on throwingover an order wire key at her position, connects at once the toll linethrough the distant toll exchange with an idle order wire to theswitching operator oi the called local exchange. so that t-he assistanceof a toll operator at the called exchange is not necessary.

Specification of Letters Patent.

Eatented Jan. 30, 1917.

Serial No. 790,674.

rlfhe switching over oi' a given order wire key at the calling tollexchange causes the energizing of a relay winding at the called exchangeand this permits a current to flow through a switching relay, attractingits armature in cases when at the called exchange the given order wireis not occupied. This arrangement permits ot' the operators sets at thecalled toll exchange also being connected with this order wire. However,the system is operated 'n such a way and the circuits at the calledexchange are so arranged that the operator at the calling exchange hasthe iirst option for the occupation of an idle order wire at the calledexchange. For this purpose the calling operator holds the order wire keyalluded to switched over, and when the order wire is busy, hears abuzzer current; as soon as the line becomes idle. however, this currentis cut oil while at the same time the order wire in question isconnected automatically with the toll line. rhe toll operator at thedistant toll exchange can test whether this order wire is idle or not bymeans of an order wire key, which indicates by a buzzer circuit thateither an operator at the same exchange or an operator of the callingexchange is using the wire. The operator at the called exchange cannotuse said order wire as long as the toll operator at the calling exchangeholds her 'rey in the operating position. lt will he evident thereforethat only one toll operator either at the calling or at the calledexchange can be put at the same time into communication with theswitching operator at the called exchange.

The operators work at the calling exchange can be still furthersimplified by the provision o'l any suitable known signaling/system withdouble supervision as is commonly used with local trailic, and of a timestamp and the operator has then only to throw down the starting key ofthe timerecorder and put a ticket into the correct box.

rllhe accompanying diagrammatic drawings illustrate byway of example asystem arranged according to the present invention. ln these drawingsonly so much of the ordinary telephone exchange circuits is -shown as isnecessary JEer a good understanding ot the invention.

To obtain a clear ideak ot the system the figures should be put side byside inthe following order from left to right :-'-3, 1, 2, 2a 4.

,Figure 1 shows the arrangements at the toll switchboard at the callingtoll exchange hereinafter designated toll exchange I. Figs. 2 and 2 showthe arrangements at the second toll exchange. Two positions for tolloperators are shown at the top of this figure. This exchange will behereinafter referred to as toll exchange II. The arrangement for theautomatic through-con nection of the toll lines from toll exchange I tothe switching section at the local exchange belonging to the tollexchange II is indicated in triplicate.

Incoming calls enter the toll exchange I through recording trunk linesnot indicated on the drawing.

The local exchanges belonging to the toll exchanges I and II are namedlocal ex'- changes I0 and IIC.7 (Figs. 3 and 4.) The A positions of thetoll operators at the toll exchange II are indicated at Ft, and Ft2.

vAssume that, for instance, a subscriber 200 of the local exchange I0desires to be connected with the subscriber 400 of the local exchangeIIC. In the usual manner by means of an order wire system thesubscriber?s line 200 is connected with a switching trunk Ll andmultiple jack m, into 'which the operator at the exchangev I inserts aplug S152. The clearing lamplc acts as a `supervisory lamp for thesubscriber 200, for

upon his hanging up his receiver the lamp t@ is lighted and the removalof the receiver from the hook extinguishes this lamp.

In order to connect the subscriber 200 (local exchange I0) with thesubscriber 400 (local exchange II) the toll operator I throws a key S2to the right. This closes Circuit (Dr-Negative terminal 1. of a battery,winding i of the induction coil", contact 2, toll line 3, 4, connectingpoint 5,- back contact 6, windings of a relay (t2, back contact 7,connecting point y8, tol-l line 9', 10, con-` tact 11, conductor 12,earth.

The relay t2 is energized and its armature. This closes Circuit(2L-Negative terminal 13'- of battery, resistance A2, 14, windings of aswitching relay 52, 15, working Contact 16 of relay a2, earth; and

Circuit (3) (of t/ze buz2er).-Buzzer, 17, working contact 18 of relaya2, back contact 19 of relay Z22, if this relay is not energized (seebelow), 5, 4, 3, 2, i, Z, battery, earth, 12, contact 11, 10, 9, 8, backcont-act 20, working contact 21, 22, buzzer.

The relay b2 is not energized when a toll operator at the position Ft,or F252 has switched' over her key 2, thereby closing"v either A Circuit(.tf) .-Negative terminal 13' of a' battery A2, 23, windings of aswitching` reoperator at the toll exchange I hears by means of theinduction coil i that the second order wire D2 is still occupied by an Aopera'tor in the toll exchange II (see circuit 3). When', however,neither of the keys 2 of the Ft, or Ft2 operators at the toll exchangeII are switched over, the switching relay, b2 attracts its armature andthetoll line I2 is put in communication with the order-wire D2, wherebythe following circuit is closed:-

Circuit (6).-Negative terminal 1 of a battery 2, 8, 4, 5, workingcontact 64 of relay 52, 34, 33, receiver 68 of the switching operator atthe local exchange IIO, secondary winding 67, condenser 66, 32, 31,working contact 65 of b2, 8, 9, 10, 11, 12, earth. The buzzercircuit (3)is broken at 19 and 20 and the operator in the toll exchange I learnsfrom thisv that the operator of the local exchange IIO has been put incommunication with the toll line I2.

The operator at the toll exchange I asks the operator at the localexchange II0 through the toll line I2 and the order wire D2 directlyvfor' the subscriber 400, and listens for a moment to ascertain whetherthe line of the subscriber 400 is already occupied witha'n'other tollconnection. This not being the case, she restores the key S2 to itsnormal position. When the key S2 has returned to its normal position,the .circuit (1) is" broken andv relayv a2 becomes' denergized, which inturn, breaks the circuit of relay b2. By means of the plug St II2 thetoll line I2 is now' connected on the switching section ot the localexchange II. with the subscribers line' 400'. This subscriber' has beencalled but not yet' answered. The lines H, and H2v are in communicationwith the receivercircuits of the respective toll operators. l

Inl the toll exchange I the lines Il and I2 run to keys S1, S2, (notindicated in the drawing) which are of similar construction to the keyS2.

The receiver of the subscriber 400 not being removed from the hook, therelay i2 at the local exchange IL, is energized by a current flowingfrom the negative terminal of a battery through the windings of relay Itto earth. vThe third conductor 35 of the plug will thus be at negativepotential and. the4V following circuits are closedf Circuit/".-'-Negative termina-l of a bat-` tery, working contact- 69 of therelay i2, 35,1

36, back Contact 37 of a relay u2, windings ot a relay c2, back contact38 of a relay e2, earth.

T he relay c2 attracts its armatures and closes:

Circuit 8.-Negative terminal 39 of a battery, windings d2, workingcontact 40 of 0. 8, 9, 10, contact 41 of the key S2, 42, relay windingf2, 43, contact 44 of the key S2, 3, 4, 5, working contact 45 of c2,earth.

T he relay attracts its armatures and the clearing lamp Z i lights. Ittakes some time before the slow-acting relay cZz, attracts itsarmatures. At the moment that this happens, the lamp Z i extinguishes,for the circuit of the relays c2 and f2 is broken and the holding coilof the relay f2 is at that moment not in communication with the negativeterminal of a battery.

Circuit .9.-Negatiife terminal of a battery, working contact 69 of therelay i2, 35, 36, 37, 46, working contact 47 of e2, winding c2, 48,earth.

As soon as the subscriber 400 removes his receiver from the hook, arelay Z at the local exchange H0 attracts its armature and the thirdconductor of the plug St Il, is put directly at negative potentialthrough the armatures and the working contacts of the relays Z and 7c. y

Circuit .9h-Negative terminal of a battery, 70, windings u, 71, workingcontact 72 ot the hook, transmitter 73 of the subscriber 400, winding 74of the induction coil, 75, winding 1, earth.

The relay i2 is thus short-circuited and the contact 69 opened. Thisde'e'nerg'izes the relay @2 and its armature falls back. The subscriberQ00 speaks with the subscriber 400 and at the beginning of theconversation the operator of the toll exchange I pushes a key 63, bywhich a clock 59 is put into operation, and inserts a ticket into thebox 61 ot a time-stamp 62 for the automatic recording ot the duration otthe conversation. (See Fig. 1).

At the finish of the conversation the two subscribers 200 and 400 hangup their receivers. As indicated below this energizes the relays g2 andf2. A battery is connected with 56 when the subscriber 200 hangs up hisreceiver, and the relay 02 is energized by a current flowing through thewindings of the relay 77, because the windings i and g,

' the call relay of subscriber 200, get no current. their energizingcircuit, negative terminal of a battery, i', subscribers line, set 200,subscribers line. a, earth, being broken.

Circuit 10.-Negative terminal of a battery, working contact 76 of therelay 0 56, contact 57 of the plug Stz, windings g2, 58, earth.

The circuit for the relay f2, is the same as the circuit 8, because onhanging up the receiver by the subscriber 400 the relay i2 at the localexchange IIO and the relay o2 at the toll exchange Il are energizedagain. The key S2 not being switched over, the holding coil of thisrelay also gets current thus:

Circuit 11.-Negative terminal 49 of a battery, contact 50, holding coilof relay f2, contact 51, 52, earth.

The lamps Z c and Z i light and the time stamp records automatically theduration oi? the conversation by the closure of:

Circuit lNegative side oi the battery 53, winding Zig, co-ntacts 54, 55,earth.

ritter the ticket is stamped, the clockwork 59 stops and the stampreturns to its normal or zero position. This time check is not anindispensable part and does not form part of the invention proper. Theplug St2 is now pulled out from the jack m and the various lines andcircuits are clear for a new connection.

Pilot lamps Z0 may be installed (as indicated on the drawing by dottedlines) in order to avoid disturbing the order wire service when anoperator Ft of the toll exchange II pushes an order wire key 1, 2 or 3permanently. In the order wire service the pilot lamps may thereforeonly flicker.

For a clear understanding ot the operation of the relays B or C thefollowing is to be noticed: When the toll operator at the position Ft1switches over her order wire key 2, if no other toll operator at thetoll exchange Il or I keeps the order'wire l), occupied, her receiver H,is cut-0E from the talking circuit of her switchboard and connected withthe order wire D2.

Circuit ].@a.-Receiver H1, back contact 77 of the order wire key 3,working contact 78 of the order wire key 2, conductor 79, workingcontact 8O of the relay B2, connecting point 81, conductor 32 of theorder wire D2, condenser 66, secondary winding 67 of the induction coil,receiver 68, conductor 33 of the orderwire D, connecting point 82,working contact 83 of the relay B2, conductor 84, working contact 85 otthe order wire key 2, back contact 86 of the order wire key 3, receiverH1.

Should a toll operator of another position, for instance at F252,depress the order wire key 2 while at the position Ft, .in the tollexchange II this order wire kev is still depressed or S2 at the callingtoll exchange I is switched over, said operator will hear a buzzer toneannouncing that the order wire D, is occupied.

Circuit 12M-Receiver H2, back contact 87 of the order wire key 3,working contact 88 of the order wire key 2, conductor 89, back contact90 of the relay C2, buzzer, back contact 91 of the relay C2, conductor92, working contact 93 oi' the order wire key 2, back contact 94 of theorder wire key 3, receiver- H2.

The relay B2 per circuit 4) or the relayr b2 (as per circuit 2) beingenergized, the drop in voltage in A2 prevents the relay C2 gettingsu'llicient current for an attraction or' its armatures (as in circuit5). The same is the case with the relay b2, when the relay B2 or therelay C2 is energized. It' several operators work at the toll exchangeH, the relays 1, Z22, b3 B1, B2 B3 and C1, C2, C3 and so on should bemade holding relays in order to prevent the falling back of thearmaturev of an energized relay, owing to a decrease of current thereinwhen other shunt circuits arranged between the same battery and earththrough other relays are closed. rlhis can be attained by providing therelays with a special armature which when attracted short circuits partof the winding and decreases the resistance of the relay; (indicated onthe drawing with a dotted line).

It will be understood that in its applicatio-n the present invention isnot limited to the particular telephone system described hereinbeiore byway of example. It is, e. g., not necessary that between the tollexchange and the appel-taining switching` section on the local exchangethere are three wire connections provided as in the example; if doublewire connections are provided the invention may just as well be applied.Those skilled in the art will appreciate that the p resent invention mayalso be made. applicable to switching systems in which there is morethan one local exchange associated with the called toll exchange as hasbeen assumed in the example. ln such case any of the well-knownselecting means ask generally employed in semiand full automatictelephone systems, such as, e; g., step by step mechanisms, may be usedfor directing 'the call to the right local exchange.

It will be easily understood that when instead of al direct connectionbetween a subscriber of a local exchange associated with a toll exchangeand a subscriber of a local exchange associated with a second tollexchange a through connection via said second toll exchange to a thirdtoll exchange is to be established, this maybe effected with theswitching system according to this invention by connecting with the tollline not the B-switching operator at the local ex- -change associatedwith said secon-d vtoll exchange but temporarily an idle A-operator atsaid second toll exchange; it will thus be possible to establishthrough-connections over lines connected according to this invention.

Having now described my invention what I claim as new and desire tosecure by Let-- ters Patent is l. ln a telephone system for handlingtoll traiiic in one direction; a plurality of stations and exchanges;means for connecting a calling stationiandfatoll exchange.; and

means ywhereby the operator at said toll exchange can connect the tollline directly with an idle order wire between aI distant toll exchangeand a switchingoperator of a local exchange associated with said distanttoll exchange.

2. in a telephone system for handling toll tra-flic in one direction; aplurality of stations and exchanges; means for connecting a calling`station and a toll exchange; a switching key at said toll exchange; arelay at a distant toll exchange; means whereby said switching keyoperates said relay; a distant local exchange; an order wire betweensaid local exchange and the distant toll exchange; and means wherebysaid relay connects the operator at the calling toll exchange' to saidorder wire and thus to the switching operator of saidA distant local orcalled exchange.

3. ln a telephone system for handling toll traiiic in` one direction; aplurality' of statraiiic in one direction; a plurality of' stations andexchanges; means for connecting a calling station and" a toll exchange;a switching key at said toll exchange; a relay at a distant tollexchange; means whereby said key operates said relay; a second switchingrelay and a battery at the distant toll exchange; means whereby thefirst relay operated fromv the call-ing toll exch-ange: completes acircuit from the ba-ttery throughy said second relay to` earth; adistant local exchange, an order wire between said'- loca-l exchange andthe distant vtoll exchange; aplurality of correr sponding order wire.keys, one for eachl operator at the distant toll exchange; means wherebyany one of sai-d order wire keys, when engaging the ordery wire inquestion, completes a circuit from said battery to earth, meansV wherebysaid second switching relay on the completing of its circuit connectsthe calling toll operator directly to the order wire and thence to thedistant local exchange should a circuit from said o battery to earth notbel closed through one 5. ln a telephone system 'for handling tolltrailic in one direction; a plurality of stations and exchanges; meansfor connecting a calling station through a local exchange to a tollexchange; means whereby the operator at said toll exchange can connect atoll line directly to an idle order wire at a distant toll exchange andthence to the switching operator of the called local exchange and meanswhereby a buzzer circuit warns any operator at the distant toll exchangewho attempts to engage the order wire already engaged by the callingtoll exchange.

6. ln a telephone system for handling toll tratlic in one direction; aplurality of stations and exchanges; means for connecting a callingstation through a local exchange to a toll exchange; a switching key .atthe toll exchange; a relay at a distant toll exchange, said relay beingadapted to be operated by the switching key at the first toll exchange;a battery and a second switching relay at theE distant toll exchange;means whereby a circuit from the battery to earth is closed through thesecond switching relay when the first relay is actuated; an order wirebetween the distant toll exchange and a distant local exchange; meanswhereby the effective energization of said second. switching relayconnects the calling toll operator to the order wire; a. plurality otorder wire kevs at the distant toll exchange; a switching relayassociated with each of the order wire keys, each adapted to connect anoperator at said distant toll exchange to the order wire; a circuit fromsaid battery to earth through each of these switching relays, thecircuit being closed when the associated order wire key is operated inthe attempt to engage the order wire; means whereby any one and one onlyof all the relays connected in shunt between said battery and earth canbe eectively energized at the same time and means whereby the operationof any of the order wire keys or of the switching key at the callingtoll exchange results in a buzzer warning being given to the concernedoperator when one of the relays connected between said battery and earthis already edectively energized.

7. In a telephone system for handling toll traic in one direction; aplurality of sta-- tions and exchanges; means for connecting a callingstation through a local exchange to a toll exchange; a switching key atthe toll exchange; a relay at a distant toll exchange, said relay beingadapted to be operated by the switching key at the iirst toll exchange;a battery and a second switching relay at the distant toll exchange;means whereby a circuit from the battery to earth is closed through thesecond switching relay when the irst relay is actuated; an order wirebetween the distanttoll exchange and a distant local exchange; meanswhereby the effective energization of said second switching relayconnects the calling toll operator to the order wire; a plurality oforder wire keys at the distant toll exchange; a switching relayassociated with each of the order wire keys each adapted to connect anaperator at said distant toll exchange to the order wire; a circuit fromsaid battery te earth through each or these switching relays; thecircuit being closed when the associated order wire key is operated inthe attempt to engage the order wire; an armature for each of the relayswhich is connected in shunt between said battery and earth; meanswhereby said armature when attracted short circuits part olf its relaywinding thus decreasing the resistance or the relay and preventing thereturn of the armature when other shunt circuits closed; means wherebyany one circuit from said battery to earth being closed, that is to say;the order wire being engaged7 the shunt current available for any otheroi' the relay circuits between the battery and earth is insutiicient toettectiyely energize the relay in said circuit; a buzzer circuit inassociation with each of the relays connected between the battery andearth; and means whereby said buzzer circuit is connected across anoperators receiver when such operator closes a circuit from the batteryto earth through a relay and the relay is not effectively energized.

8. ln a telephone system for handling toll trahie in one direction; aplurality of stations and exchanges; means for connecting a callingsubscriber through a local exchange to a toll exchange; means wherebythe operator at said toll exchange can connect the toll line directlywith an idle order wire between a distant toll exchange and a switchingoperator ot a local exchange associated with said distant toll exchange;a switching trunk whereby this switching operator can connect the calledsubscriber' to the toll line; a lamp at the calling toll exchange; meanswhereby said lamp lights when the called subscriber is to bedisconnected from the toll line and has hung his receiver on the hook.

9. ln a telephone system for handling toll traffic in one direction; aplurality oit stations and exchanges; means for connecting a callingsubscriber through a local exchange to a toll exchange; a switching keyat said toll exchange; a relay at a distant toll exchange; means wherebysaid switching key operates said relay; a distant local exchange; anorder wire between the distant toll exchange and the distant localexchange; means whereby the operation of said relay connects the callingtoll exchange to the order wire and thence to the distant localexchange; a switching trunk whereby the switching operator at lthedistant local exchange can connect .the #called subscriber to a tollline; a further line 'between the distant toll exchange and the distantlocal exchange; a relay (02) at the distant toll exchange; meanswhereby, when the .called subscriber is connected to the toll lines,When the receiver of the called subscriber is on its hook and when theswitching key at the calling toll exchange is in its ,rest position sothat the relay at thedistant :toll exchange which vis adapted to beoperated by said key is not energized, -a Ycircuit 1i-S Closed throughand energizes said `relay (021), a slowing-acting relay (d, e2) at .the:distant toll exchange; a separate holding Winding on said sloweactingrelay; a relay (f2) and a lamp at the calling toll exchange; aneanswhereby a circuit 'between a battery and earth is closed through saidlamp When the relay (f2) is energized; -ineans whereby the energizationof the relay (02') closes Ya circuit through the `slowfacting relay, atoll line between the distant toll exchange and the icallin-g tollexchange, yther'switching key at .the Lcalling; toll exchange, providedsaid key A'is in its `said rest position, and the relay (f2) which isenergized so y,that the :lamp associated with it lightS up; meanswhereby the sloweacting relay eventually breaks the circuit through ltherelay (Q2) .and thereforel iCAROLUS ROBERT l.HENDRIK ARNTZENI'U S.

Copies of this patent may be obtained for five cents each, by addressing,the A(Joxmnissioner of Patents, Washingtoml). C.

